150 lb force Switchable Magnet

This new design of rare-earth switchable magnet produces the greatest
strength with the least volume of any on the market. Switchable magnets
are most

useful for shop jigs, particularly for drill presses, bandsaws and router tables
 anywhere that other types of clamping interferes with the material
being worked.

This low-profile (0.740"/19mm) 150 lb force switchable magnet
has a 2-5/8" long integral attachment flange that can even be a jig
in itself; for example, you can use it as a bandsaw fence when ripping
an inch or two off a board, or use two magnets on a drill press for repetitive
drilling. If a jig is going to be subjected to any significant rotational
force, it is better to use two magnets on it so that rotational forces
can be converted to shear forces. A good example is a featherboard for
a table saw, where rotational forces are experienced when a board is just
starting to enter the fingers and when exiting the fingers.

The magnet is particularly easy to install since it attaches to the edge
of a jig; it does not have to be recessed into it. They usually can be
mounted with ordinary wood screws, but for softwoods, MDF or chipboard,
where pull-out strength can be less, we include machine screws and dowel
nuts for more secure attachment. Although the magnet has pull-off resistance
up to 165 lb of force in ideal conditions, you can expect a minimum of
150 lbs when attached to iron or steel 1/4" thick or greater.